fix(windows): wait for Qt before getting bounds

[Nerixyz]

Since we don't use the bounds provided by WM_SIZE itself to account for Qt's High-DPI scaling, we need to wait for Qt to have processed the message before saving our bounds. Technically, this could use the bounds we get from GetClientRect and emulate Qt's scaling, but I don't think that's smart (because Qt might change stuff, etc...).

postToThread isn't the best name for this use-case, because we're only interested in queuing an event after Qt has processed the native message. It's more like nextTick or rather endOfThisTick or beforeNextTickButAfterAllCurrentEvents.

The same is done for WM_MOVE which needs to be processed by Qt.

Things to test

• Snap 1
  1. Open Chatterino
  2. Resize the window
  3. Snap the window to one side of the monitor
  4. Close Chatterino
  5. Open it again [it should open at the same position & size]
• Snap 2
  1. Open Chatterino [the window must not be the same size as after the snap - in that case, resize and reopen]
  2. Snap the window
  3. Close Chatterino
  4. Reopen [it should open at the same position & size]
• Snap 3
  1. Open Chatterino
  2. Snap the window
  3. Close Chatterino
  4. Reopen [it should open at the same position & size]
  5. Close Chatterino
  6. Reopen [it should open at the same position & size]
  7. Drag the window
  8. Close Chatterino
  9. Reopen [it should open at the same position & size]
  10. Snap the window to the same side as in step 2
  11. Reopen [it should open at the same position & size]
• Maxi 1 [regression test]
  1. Open Chatterino
  2. Resize the window
  3. Maximize the window
  4. Restore the window [it should have the same geometry as after step 2]
  5. Maximize the window
  6. Close Chatterino
  7. Reopen [it should open maximized]
  8. Restore it [no constraint - compare to e.g. explorer]
• Maxi 2
  1. Open Chatterino
  2. Resize the window
  3. Snap the window
  4. Maximize the window
  5. Restore the window [it should have the same geometry as after step 3]
  6. Maximize the window
  7. Close Chatterino
  8. Reopen [it should open maximized]
• Maxi 3
  1. Open Chatterino
  2. Resize the window
  3. Snap the window
  4. Maximize the window
  5. Restore the window [it should have the same geometry as after step 3]
  6. Close Chatterino
  7. Reopen [it should open at the same position & size]
• Mini 1
  1. Open Chatterino
  2. Resize the window
  3. Snap the window
  4. Minimize the window
  5. Close Chatterino (through the taskbar)
  6. Reopen [it should open at the same position & size; minimized]
• Mini 2 [regression test]
  1. Open Chatterino
  2. Resize the window
  3. Move the window
  4. Minimize the window
  5. Close Chatterino (through the taskbar)
  6. Reopen [it should open at the same position & size; minimized]
• Minimax [regression test]
  1. Open Chatterino
  2. Maximize the window
  3. Minimize the window
  4. Close Chatterino (through the taskbar)
  5. Reopen [it should open maximized but minimized]

Fixes #5477.

[8thony]

on commit b2edb96
https://github.com/Chatterino/chatterino2/assets/114905842/e8c507fd-d82e-4fdf-a1c3-b988223e8096

[8thony]

My issue is fixed. Thank you