[CP] Space character should be optional when tree shaking fonts

[eyebrowsoffire]

Issue Link

#132711

Commit Hash

6f227c0

Target

stable

PR Link

#132882

Changelog Description

Fixes an issue with tree shaking fonts that do not contain a space glyph.

Impacted Users

Flutter Web apps that have custom fonts that do not contain a space glyph

Impact Description

The flutter tool fails out with an error when attempting to compile an app that uses a custom icon font that does not contain a space.

Workaround

The user can pass --no-tree-shake-icons to prevent icon tree shaking, which will allow the flutter tool to complete the build process. However, it skips icon tree shaking, which bloats the payload size of their font files.

Risk

low

Test Coverage

yes

Validation Steps

Unit tests verify that the tool is feeding the proper into the font subset tool. Also, verified that the repository provided in #132711 can now build for web without issue.

[zanderso]

CP LGTM. The linked PR depends on the Engine CP flutter/engine#44869 landing first.

[itsjustkevin]

Looks like flutter/engine#44869 is just waiting on a review. Will merge once it is reviewed as all tests are already passing.

[github-actions]

This thread has been automatically locked since there has not been any recent activity after it was closed. If you are still experiencing a similar issue, please open a new bug, including the output of flutter doctor -v and a minimal reproduction of the issue.