New stroke doesn't render when start position is not visible

[gepbird]

Describe the bug
When drawing a stroke and scrolling, so that the beginning of the stroke is off the view, the stroke won't be visible.

To Reproduce
Steps to reproduce the behavior:

1. Start drawing a stroke
2. Scroll so the start position is off the window
3. Observer stroke not rendering

Expected behavior
The stroke should render

Console Output
No output.

Screenshots See the mouse state in the bottom left corner

https://github.com/flxzt/rnote/assets/29818440/216e24be-b0a0-49f7-9d07-2983887671a6

Desktop (please complete the following information):

• OS: NixOS (nixos-unstable)
• App Version: Rnote v0.9.2
• Installation Source: nixpkgs
• Desktop Environment: dwm

Additional context
I discovered this bug when experimenting with a touchpad gesture in rnote: with 2 fingers, I can move the view instead of the cursor, and additionally by pressing down the left mouse button, I can draw with only moving the view and keeping the cursor stationary.

[gepbird]

A minor related bug: when drawing a stroke and scrolling with a mouse without moving the cursor, the last line segment is not rendered, see the video.

https://github.com/flxzt/rnote/assets/29818440/8a5dc233-b200-4e07-9dee-ec511fd3fa0a

When releasing the mouse button everything works as expected (for this minor and the main issue too).