FramePadding Is Not Re-Aligned For Clipping When Altered

[atom0s]

Version/Branch of Dear ImGui: 0ea4408 (Latest as of this post.)

Version: 1.80WIP
Branch: master

Back-end/Renderer/Compiler/OS

Back-ends: imgui_impl_win32.cpp + imgui_impl_dx9.cpp (and my own for Direct3D8)
Compiler: Visual Studio 2019 16.8.4
Operating System: Windows 10

My Issue/Question:

When altering the global FramePadding value, the clip handling inside of ImGui does not account for the changes.
This causes things like text to run past their expected clipping sections.

This is reproducible in the main branch code, as-is just by altering the FramePadding size.

1. Clone the latest master.
2. Compile the examples.
3. Run the Direct3D9 example.
4. Open the Styles editor. (Tools -> Style Editor)
5. Change FramePadding to 3x2.

Next, in the Dear ImGui Demo window, go to Window Options and check No Close.

Now you can slowly resize the window until the title text clips past the window frame. This is easier to see with a magnifier. (Windows has one built-in if needed.)

Screenshots/Video

Standalone, minimal, complete and verifiable example: (see #2261)

See steps above to use the current examples to test this.

[atom0s]

Since this is somewhat related, there is also a small issue with the clip rect not accounting for frame borders.
Rendered text will bleed into the frame border as well by 1 pixel, sitting in the frame borders space.

Using the same setup as I outlined above with the d3d9 example, setting Frame Border Size to 1 yields:

Without it enabled, the title text also still bleeds into the edge of the window too:

[ocornut]

Hello,

I can repro the first issue but not the second (which doesn't have a repro listed), even with WindowPadding.x = 0:

(PS: you can disable "Smoothing" in Windows's horrible magnifying tool)

[atom0s]

For the second one, it is just that the word is hitting the edge of the window vs. being 1-pixel inset to the edge of the window.

For reproducing this one:

1. Clone current master.
2. Build examples.
3. Run Direct3D 9 example.
4. In the demo window, Window Options -> Check No Close
5. Resize the window til the word Demo is against the right-side edge of the window.

Here the 'O' in Demo is hitting the very edge of the window where the 1-pixel frame is. If you turn on/off the window border, the font is not adjusted based on it being there. It just sits ontop of it.

[ocornut]

Both issues should be fixed by 6b32d0e
Thank you!