Scale Tree.INSET by zoom level instead of using fixed pixels

The Tree.INSET constant defines the spacing between an item's image and text.
Previously, this was a fixed value of 3px, which looks correct at 100% zoom but
causes the image and text to appear cramped on higher-DPI displays.

This change defines INSET in points and converts it to pixels based on the
current zoom level (e.g. 6px at 200%), ensuring consistent spacing across
different monitor scales.

Author: ShahzaibIbrahim

bundles/org.eclipse.swt/Eclipse SWT/win32/org/eclipse/swt/widgets/Tree.java

@@ -749,7 +749,7 @@ LRESULT CDDS_ITEMPOSTPAINT (NMTVCUSTOMDRAW nmcd, long wParam, long lParam) {
 						}
 					}
 				}
-				rect.left += INSET - 1;
+				rect.left += Win32DPIUtils.pointToPixel(INSET - 1, zoom) ;
 				if (drawImage) {
 					Image image = null;
 					if (index == 0) {
@@ -758,8 +758,8 @@ LRESULT CDDS_ITEMPOSTPAINT (NMTVCUSTOMDRAW nmcd, long wParam, long lParam) {
 						Image [] images  = item.images;
 						if (images != null) image = images [index];
 					}
-					int inset = i != 0 ? INSET : 0;
-					int offset = i != 0 ? INSET : INSET + 2;
+					int inset = i != 0 ? Win32DPIUtils.pointToPixel(INSET, zoom) : 0;
+					int offset = i != 0 ? Win32DPIUtils.pointToPixel(INSET, zoom) : Win32DPIUtils.pointToPixel(INSET + 2, zoom);
 					if (image != null) {
 						Rectangle bounds = image.getBounds (); // Points
 						if (size == null) size = Win32DPIUtils.pixelToPoint (getImageSize (), zoom); // To Points
@@ -5484,7 +5484,7 @@ public void showColumn (TreeColumn column) {
 			SCROLLINFO info = new SCROLLINFO();
 			info.cbSize = SCROLLINFO.sizeof;
 			info.fMask = OS.SIF_POS;
-			info.nPos = Math.max(0, headerRect.left - Tree.INSET / 2);
+			info.nPos = Math.max(0, headerRect.left - Win32DPIUtils.pointToPixel(INSET / 2, getZoom()));
 			OS.SetScrollInfo(hwndParent, OS.SB_HORZ, info, true);
 			setScrollWidth();
 		} else if (scrollBecauseRight) {
@@ -5498,8 +5498,8 @@ public void showColumn (TreeColumn column) {
 			// info.nPos + wideRect = headerRect.left + wideHeader
 			// info.nPos = headerRect.left + wideHeader - wideRect
 			info.nPos = Math.max(0, wideHeader + headerRect.left - wideRect
-					- Tree.INSET / 2);
-			info.nPos = Math.min(rect.right - Tree.INSET / 2, info.nPos);
+					- Win32DPIUtils.pointToPixel(INSET / 2, getZoom()) );
+			info.nPos = Math.min(rect.right - Win32DPIUtils.pointToPixel(INSET / 2, getZoom()), info.nPos);
 
 			OS.SetScrollInfo(hwndParent, OS.SB_HORZ, info, true);
 			setScrollWidth();
@@ -7925,7 +7925,7 @@ LRESULT wmNotifyHeader (NMHDR hdr, long wParam, long lParam) {
 							}
 						}
 
-						int x = rects[i].left + INSET + 2;
+						int x = rects[i].left + Win32DPIUtils.pointToPixel(INSET + 2, getZoom());
 						if (columns[i].image != null) {
 							GCData data = new GCData();
 							data.device = display;
@@ -8243,7 +8243,7 @@ LRESULT wmNotifyToolTip (NMTTCUSTOMDRAW nmcd, long lParam) {
 							data.background = OS.GetBkColor (nmcd.hdc);
 							data.font = Font.win32_new (display, hFont);
 							GC gc = createNewGC(nmcd.hdc, data);
-							int x = cellRect [0].left + INSET;
+							int x = cellRect [0].left + Win32DPIUtils.pointToPixel(INSET, getZoom());
 							if (index [0] != 0) x -= gridWidth;
 							Image image = item [0].getImage (index [0]);
 							if (image != null || index [0] == 0) {
@@ -8254,11 +8254,11 @@ LRESULT wmNotifyToolTip (NMTTCUSTOMDRAW nmcd, long lParam) {
 									Rectangle rect = image.getBounds (); // Points
 									int zoom = getZoom();
 									gc.drawImage (image, rect.x, rect.y, rect.width, rect.height, DPIUtil.pixelToPoint(x, zoom), DPIUtil.pixelToPoint(imageRect.top, zoom), DPIUtil.pixelToPoint(size.x, zoom), DPIUtil.pixelToPoint(size.y, zoom));
-									x += INSET + (index [0] == 0 ? 1 : 0);
+									x += Win32DPIUtils.pointToPixel(INSET, getZoom()) + (index [0] == 0 ? 1 : 0);
 								}
 								x += size.x;
 							} else {
-								x += INSET;
+								x += Win32DPIUtils.pointToPixel(INSET, getZoom());
 							}
 							String string = item [0].getText (index [0]);
 							if (string != null) {

bundles/org.eclipse.swt/Eclipse SWT/win32/org/eclipse/swt/widgets/TreeItem.java

@@ -444,7 +444,7 @@ RECT getBounds (int index, boolean getText, boolean getImage, boolean fullText,
 		if (getImage && !fullImage) {
 			if (OS.SendMessage (hwnd, OS.TVM_GETIMAGELIST, OS.TVSIL_NORMAL, 0) != 0) {
 				Point size = parent.getImageSize ();
-				rect.left -= size.x + Tree.INSET;
+				rect.left -= size.x + Win32DPIUtils.pointToPixel(Tree.INSET, getZoom());
 				if (!getText) rect.right = rect.left + size.x;
 			} else {
 				if (!getText) rect.right = rect.left;
@@ -496,7 +496,7 @@ RECT getBounds (int index, boolean getText, boolean getImage, boolean fullText,
 			}
 			if (getText) {
 				if (fullText && clip) {
-					rect.left = rect.right + Tree.INSET;
+					rect.left = rect.right + Win32DPIUtils.pointToPixel(Tree.INSET, getZoom());
 					rect.right = headerRect.right;
 				} else {
 					String string = index == 0 ? text : strings != null ? strings [index] : null;
@@ -517,10 +517,10 @@ RECT getBounds (int index, boolean getText, boolean getImage, boolean fullText,
 							OS.ReleaseDC (hwnd, hNewDC);
 						}
 						if (getImage) {
-							rect.right += textRect.right - textRect.left + Tree.INSET * 3;
+							rect.right += textRect.right - textRect.left + Win32DPIUtils.pointToPixel(Tree.INSET * 3, getZoom());
 						} else {
-							rect.left = rect.right + Tree.INSET;
-							rect.right = rect.left + (textRect.right - textRect.left) + Tree.INSET;
+							rect.left = rect.right + Win32DPIUtils.pointToPixel(Tree.INSET, getZoom());
+							rect.right = rect.left + (textRect.right - textRect.left) + Win32DPIUtils.pointToPixel(Tree.INSET, getZoom());
 						}
 					}
 				}
@@ -918,9 +918,8 @@ public Rectangle getTextBounds (int index) {
 Rectangle getTextBoundsInPixels (int index) {
 	if (!parent.checkData (this, true)) error (SWT.ERROR_WIDGET_DISPOSED);
 	RECT rect = getBounds (index, true, false, true);
-	if (index == 0) rect.left += Tree.INSET - 1;
 	rect.left = Math.min (rect.left, rect.right);
-	rect.right = rect.right - Tree.INSET + 1; // Add 1 px margin to avoid truncation of text seen with "Segoe UI" font
+	rect.right = rect.right + Win32DPIUtils.pointToPixel(Tree.INSET, getZoom()); // Add INSET margin to avoid truncation of text seen with "Segoe UI" font
 	int width = Math.max (0, rect.right - rect.left);
 	int height = Math.max (0, rect.bottom - rect.top);
 	return new Rectangle (rect.left, rect.top, width, height);