Log Message:
editors/featherpad: update to 1.3.5

V1.3.5
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 - Used QPointer for TextEdit's highlighter (for a more robust code but without
   behavior change).
 - Enabled tab DND under Wayland (by detaching or dropping the tab after
   finishing the DND) and improved tab DND in general.
 - Always open a group of files in a single window, even when the app is
   configured to open files in separate windows.
 - Prevented total item deselection in the side-pane mode with Qt6.
 - Added the side-pane and session actions to the toolbar.
 - Limited the side-pane's default width to 40 times the width of the space
   character of the widget font.