Window Snapping not working for GTK3 apps

Bug Reports
1

Describe the bug
BTT's "window snap" feature does not work (there is no "snap") with GTK3 apps on MacOS Mojave and Catalina.

To reproduce the bug, install a GTK3 app, e.g. Zim

brew install zim

Open it, and test the snap functionality with zim's window (e.g. 1/2 screen tile, by dragging the window to the left or right screen edge) and confirm it doesn't work :slight_smile:
FWIW, windows of older GTK2 apps e.g. older versions of zim were working fine with BTT window snapping.

Affected input device (e.g. MacBook Trackpad, Magic Mouse/Trackpad, Touch Bar, etc.):

All

Screenshots
N/A

Device information:

  • Type of Mac: Macbook
  • macOS version: Catalina 10.15, however the same problem was happening in all Mojave versions. I haven't tested earlier versions of macos.
  • BetterTouchTool version: all versions - this never worked

Additional information (e.g. StackTraces, related issues, screenshots, workarounds, etc.):

2

sorry, unfortunately this is a general problem with such apps, as they don’t implement the macos standard window APIs correctly.
Most likely there won’t be a way to fix this, but i’ll have a look at the app you mentioned.

Probably the developers of GTK3 would need to implement the required API