Add option to disable mouse input / fix touchscreen auto-disable

[Mase3206]

Please add an option to disable mouse input for drawing. This would be nice for users with drawing tablets (either dedicated or embedded into their touch screen, like in ThinkPads and Surface Pros). It seems possible, since the mouse and drawing tablet have different classes (InputManager::Mouse and InputManager::Pen, respectively).

I'm not a C++ developer, and I have no familiarity with the project's architecture, but I imagine it may be possible to add a toggle or line in a config file somewhere to control this, assuming they are handled differently internally.

[Mase3206]

It seems like drawing tablet detection is implemented, but it's a bit buggy. This is what drawing looks like with the mouse or touchscreen before bringing the pen to the screen to wake it up.

And this is what it looks like after connecting the pen. The pen draws fine (see: the thinner line), but it still recognizes touch screen inputs, though it only draws a dot and will not follow your finger. It has no issue drawing lines withe mouse.

This video demonstrates that better than an image can.

https://photos.dashomelab.org/share/8qC3Tsx1iXBFh1T6_ZuyB2Cli6xQONFxk6xqWjbP33siXs66_eQ_BFPrhct3hKgqCXk (apologies if it's slow to load, my homelab's upload speed is very bad)

[ErrorAtLine0]

Thank you for bringing up these issues. For the option to disable mouse input, can you give me more details as to how/when the mouse should be disabled? Does it disable only when the brush/eraser are used, only with the brush, or with all tools? Does it disable only when I'm currently drawing a brush stroke, or all the time as long as these tools are selected? I just want to know how this feature should be implemented, since I don't really use an option similar to this in other programs.

As for the touchscreen issue, I'm not sure I can fix this issue right now. I'm not able to replicate it with the closest setup I have on hand to yours (an old lenovo touchscreen laptop, but only with a dedicated pen tablet and not an active pen since I don't own one). Infinipaint doesn't have anything specific to touchscreen input (the input library just takes touchscreen input as mouse input), and since the issue doesn't appear when you draw with the mouse, it's hard for me to know where the issue is just by looking at my code.