fix drag selection extension (does not start at tap location if you are dragging quickly

[jezell]

Description

This fixes an issue with selection dragging when dragging quickly. If dragging quickly, the selection was extending from the location it was in before the tap down, rather than starting at the location where the tap down occurred.

Related Issues

• Fix default color, Document.fromDelta, fix isItCut null check #123
• Related Image save on readonly mode #456

Type of Change

• ✨ New feature: Adds new functionality without breaking existing features.
• 🛠️ Bug fix: Resolves an issue without altering current behavior.
• 🧹 Code refactor: Code restructuring that does not affect behavior.
• ❌ Breaking change: Alters existing functionality and requires updates.
• 🧪 Tests: Adds new tests or modifies existing tests.
• 📝 Documentation: Updates or additions to documentation.
• 🗑️ Chore: Routine tasks, or maintenance.
• ✅ Build configuration change: Changes to build or deploy processes.

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