windows: Add Finish page to uninstaller

Back in a time a warning message has been added to uninstaller that was
saying that some files are removed by it - files that were created by
Eclipse, for example. However it seems that this message wasn't in the
version imported to GitHub, and nobody noticed for one and half year. This
commits returns this message. See STAR 9000691488.

Signed-off-by: Anton Kolesov <[email protected]>

Author: anthony-kolesov

windows-installer/installer.nsi

@@ -71,8 +71,19 @@ RequestExecutionLevel admin
 !insertmacro MUI_PAGE_COMPONENTS
 !insertmacro MUI_PAGE_DIRECTORY
 !insertmacro MUI_PAGE_INSTFILES
+
+# Uninstaller pages mostly use same defines as installer ones, so to have
+# different texts, defiens should be done twice: for install page and for
+# uninstall page.
+!define MUI_FINISHPAGE_TEXT "Please note: uninstall process can only remove \
+files created by the installer. Programs like Eclipse may create files \
+which will be left behind by the installer. Users should manually remove these \
+file after uninstall to avoid any problems, especially when uninstalling to \
+upgrade to new version being re-installed to same location."
+
 !insertmacro MUI_UNPAGE_CONFIRM
 !insertmacro MUI_UNPAGE_INSTFILES
+!insertmacro MUI_UNPAGE_FINISH
 
 !insertmacro MUI_LANGUAGE "English"