Merge pull request zyedidia#3271 from JoeKar/fix/inactive-mouse-release

Fix lost mouse release events in case the pane becomes inactive

Author: JoeKar

internal/action/bufpane.go

@@ -500,12 +500,17 @@ func (h *BufPane) HandleEvent(event tcell.Event) {
 			// Mouse event with no click - mouse was just released.
 			// If there were multiple mouse buttons pressed, we don't know which one
 			// was actually released, so we assume they all were released.
+			pressed := len(h.mousePressed) > 0
 			for me := range h.mousePressed {
 				delete(h.mousePressed, me)
 
 				me.state = MouseRelease
 				h.DoMouseEvent(me, e)
 			}
+			if !pressed {
+				// Propagate the mouse release in case the press wasn't for this BufPane
+				Tabs.ResetMouse()
+			}
 		}
 	}
 	h.Buf.MergeCursors()

internal/action/tab.go

@@ -124,6 +124,12 @@ func (t *TabList) HandleEvent(event tcell.Event) {
 					return
 				}
 			}
+		case tcell.ButtonNone:
+			if t.List[t.Active()].release {
+				// Mouse release received, while already released
+				t.ResetMouse()
+				return
+			}
 		case tcell.WheelUp:
 			if my == t.Y {
 				t.Scroll(4)
@@ -166,6 +172,26 @@ func (t *TabList) SetActive(a int) {
 	}
 }
 
+// ResetMouse resets the mouse release state after the screen was stopped
+// or the pane changed.
+// This prevents situations in which mouse releases are received at the wrong place
+// and the mouse state is still pressed.
+func (t *TabList) ResetMouse() {
+	for _, tab := range t.List {
+		if !tab.release && tab.resizing != nil {
+			tab.resizing = nil
+		}
+
+		tab.release = true
+
+		for _, p := range tab.Panes {
+			if bp, ok := p.(*BufPane); ok {
+				bp.resetMouse()
+			}
+		}
+	}
+}
+
 // Tabs is the global tab list
 var Tabs *TabList
 
@@ -184,20 +210,7 @@ func InitTabs(bufs []*buffer.Buffer) {
 		}
 	}
 
-	screen.RestartCallback = func() {
-		// The mouse could be released after the screen was stopped, so that
-		// we couldn't catch the mouse release event and would erroneously think
-		// that it is still pressed. So need to reset the mouse release state
-		// after the screen is restarted.
-		for _, t := range Tabs.List {
-			t.release = true
-			for _, p := range t.Panes {
-				if bp, ok := p.(*BufPane); ok {
-					bp.resetMouse()
-				}
-			}
-		}
-	}
+	screen.RestartCallback = Tabs.ResetMouse
 }
 
 func MainTab() *Tab {