Add configuration options for modal editor dimensions

[mrleemurray]

Introduce configuration options for setting minimum width and height of the modal editor overlay. Refactor existing code to utilize these new settings, ensuring a more flexible and customizable user experience.

Before

After

[Copilot]

Pull request overview

Adds configurable minimum dimensions for the modal editor overlay and wires them into the modal editor sizing logic, with tailored defaults for the Sessions window experience.

Changes:

• Registers new settings: workbench.editor.modalMinWidth and workbench.editor.modalMinHeight.
• Refactors ModalEditorPart to derive minimum sizing constraints from configuration (and to use the width value for sidebar clamping).
• Overrides default values for these settings in the Sessions window default configuration.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
src/vs/workbench/browser/workbench.contribution.ts	Adds configuration schema entries for modal min width/height.
src/vs/workbench/browser/parts/editor/modalEditorPart.ts	Uses the new configuration values to set modal min size and sidebar resizing limits.
src/vs/sessions/contrib/configuration/browser/configuration.contribution.ts	Sets Sessions window defaults for the new modal sizing settings.

[vs-code-engineering]

📬 CODENOTIFY

The following users are being notified based on files changed in this PR:

@bpasero

Matched files:

• src/vs/workbench/browser/parts/editor/modalEditorPart.ts
• src/vs/workbench/browser/workbench.contribution.ts

[bpasero]

I do not understand the need for this, esp. why a user should configure this. An editor should be able to declare its preferred min width (we already have that infrastructure in place) and then the modal editor respecting that.

Lets not do this for now, lets focus on P0s.