fix(tabbar): disable scroll buttons in tab bar

[GongHeng2017]

The tab bar currently shows the built-in left/right scroll buttons when tabs overflow. This introduces extra navigation controls that are not needed for the editor UI.

Disable the DTabBar scroll buttons while keeping the add-tab action available, so the tab strip keeps a cleaner and more consistent layout.

Log: fix issue
Bug: https://pms.uniontech.com/bug-view-375693.html

Summary by Sourcery

Bug Fixes:

• Disable the tab bar’s built-in scroll buttons to remove unnecessary overflow navigation controls while preserving tab addition.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

The tab bar constructor now disables built-in scroll buttons for overflowing tabs, resulting in a cleaner editor tab layout while retaining the add-tab action and other existing tab interactions.

File-Level Changes

Change	Details	Files
Disable the tab bar’s built-in overflow scroll controls while preserving existing tab management actions.	Configure DTabBar to not use left/right scroll buttons. Keep movable, closable, add-tab, drag, and drop behavior unchanged.	src/controls/tabbar.cpp

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[sourcery-ai]

Hey - I've found 1 issue

Prompt for AI Agents

Please address the comments from this code review:

## Individual Comments

### Comment 1
<location path="src/controls/tabbar.cpp" line_range="70" />
<code_context>
     setMovable(true);
     setTabsClosable(true);
     setVisibleAddButton(true);
+    setUsesScrollButtons(false);
     setDragable(true);
     setAcceptDrops(true);
</code_context>
<issue_to_address>
**issue (broader_impact):** When the tab count exceeds the available width, `Tabbar::tabSizeHint` enforces a minimum tab width of 110 pixels, so all tabs cannot fit. Disabling scroll buttons removes DTabBar's overflow navigation, causing tabs beyond the viewport to be clipped and impossible to select by clicking.

**Triggers:** When enough tabs are open that their combined minimum width exceeds the tab bar width.

**Suggested fix:** Keep an overflow navigation mechanism, such as the scroll buttons or an overflow menu, or revise the tab sizing/layout so every tab remains reachable without scrolling.

```suggestion
    setUsesScrollButtons(true);
```
</issue_to_address>

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[sourcery-ai]

issue (broader_impact): When the tab count exceeds the available width, Tabbar::tabSizeHint enforces a minimum tab width of 110 pixels, so all tabs cannot fit. Disabling scroll buttons removes DTabBar's overflow navigation, causing tabs beyond the viewport to be clipped and impossible to select by clicking.

Triggers: When enough tabs are open that their combined minimum width exceeds the tab bar width.

Suggested fix: Keep an overflow navigation mechanism, such as the scroll buttons or an overflow menu, or revise the tab sizing/layout so every tab remains reachable without scrolling.

Suggested change

	setUsesScrollButtons(false);
	setUsesScrollButtons(true);

[deepin-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: GongHeng2017, lzwind

The full list of commands accepted by this bot can be found here.

Details

Needs approval from an approver in each of these files:

• debian/deepin/OWNERS

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[GongHeng2017]

/forcemerge

[deepin-bot]

This pr force merged! (status: unstable)