Merge branch 'geenz/fix/more-mirror-fixes' of https://github.com/secondlife/viewer into merge/materials_featurette

Merge branch 'release/materials_featurette' of https://github.com/secondlife/viewer into merge/materials_featurette

Merge branch 'geenz/fix/more-mirror-fixes' of https://github.com/secondlife/viewer into merge/materials_featurette

Merge branch 'release/materials_featurette' of https://github.com/secondlife/viewer into merge/materials_featurette

* Fix for SL-20652 shadows on mac breaking alpha blended objects.

fix secondlife/jira-archive-internal#71030

* clean up surrounding indentation

* Skip unnecessary casting

* Clean up LLGLSLShader::sIndexedTextureChannels usage and improve fix for SL-20652

secondlife/viewer-private#230: Amend terrain loading test plan

Add more details to Behavior overview.

 #1370 Additional tightening of the probe selection to ensure that we even skip the rest of the probe update.

This reverts commit ab82d114.

FLN-about-land-infobar-text Added a click listener to the text

See merge request !142

#886 Fix for crash in LLBumpImageList when connecting to a simulator with different feature flags (#1345)

Misc modify.