Fix unintended bracket duplication in Kate editor

Summary

When working in the Kate text editor, pressing Enter after a bracket ( (, {, or [ ) results in the editor automatically inserting a matching closing bracket on the next line.
This auto‑completion behavior, while useful in some contexts, was inadvertently enabled in the user’s configuration and caused frustration because it seemed to double‑duplicate the original opening bracket.

Root Cause

Kate’s Smart Tag feature was enabled for all bracket pairs.
The default key bindings, together with the smart closing option, trigger a secondary insertion when the cursor sits immediately after an opening bracket.
The user’s configuration file (~/.config/kate/kateglobalsrc) had the following entry, left at its default value:
```
[Editing]
SmartTag=yes
```
which activates the unintended duplication on line breaks.

Why This Happens in Real Systems

Global settings can override per-file or per-project preferences.
Auto‑insert features often rely on heuristics that misinterpret common editing patterns (e.g., a developer typing { to start a code block).
Users may enable a feature for one use case, unaware that it applies universally unless scoped explicitly.

Real-World Impact

Productivity loss: extra keystrokes to delete spurious brackets.
Code quality: unwanted characters can break syntax, causing linting and compilation errors.
Developer frustration: leads to frequent toggling of settings without fully understanding their scope.

How Senior Engineers Fix It

Disable Smart Tag for brackets that shouldn’t auto‑complete:
```
[Editing]
SmartTag=yes
UntabProgress=0
```
remove or comment out the line that forces auto‑completion for {, [, and (.
Scope settings to the current project by creating a .kateprojectrc file with specific overrides.
Test after change by creating a new file, inserting a bracket, and pressing Enter to confirm no duplication.
Educate the team on the impact of global vs. local settings and provide a quick-reference guide.

Why Juniors Miss It

Often assume default settings are correct; they neither check kateglobalsrc nor understand that a feature can be globally enabled.
Tend to focus on editor shortcuts without realizing that pressing Enter after a bracket can trigger auto‑completion.
May overlook configuration files hidden in ~/.config/kate/ because they are not part of the project directory.