User reports crash when opening the tool window

[gabrielchl]

Initial report

• user using Windows, IntelliJ IDEA v2024.1.4
• pets plugin v0.1.7
• toolwindow crash on being opened, with the following thread dump provided:

"AWT-EventQueue-0" prio=0 tid=0x0 nid=0x0 waiting on condition
     java.lang.Thread.State: WAITING
 on java.awt.MediaTracker@23cc6195
	at [email protected]/java.lang.Object.wait(Native Method)
	at java.desktop/java.awt.MediaTracker.waitForID(MediaTracker.java:681)
	at java.desktop/java.awt.MediaTracker.waitForID(MediaTracker.java:634)
	at dev.gabrielchl.intellijPets.utils.Utilities.waitForImageToLoad(utils.kt:15)
	at dev.gabrielchl.intellijPets.toolWindow.Pet.<init>(Pet.kt:64)
	at dev.gabrielchl.intellijPets.toolWindow.PetsToolWindowFactory$PetsToolWindowContentPanel.createPets(PetsToolWindowFactory.kt:72)
	at dev.gabrielchl.intellijPets.toolWindow.PetsToolWindowFactory$PetsToolWindowContentPanel.<init>(PetsToolWindowFactory.kt:44)
	at dev.gabrielchl.intellijPets.toolWindow.PetsToolWindowFactory$PetsToolWindowContent.<init>(PetsToolWindowFactory.kt:28)
	at dev.gabrielchl.intellijPets.toolWindow.PetsToolWindowFactory.createToolWindowContent(PetsToolWindowFactory.kt:21)
	at com.intellij.openapi.wm.impl.ToolWindowImpl.createContentIfNeeded(ToolWindowImpl.kt:596)
	at com.intellij.openapi.wm.impl.ToolWindowImpl.scheduleContentInitializationIfNeeded

Attempted fix with v0.1.9

• following the report, and with the info in the thread dump it seems like it got stuck loading the spritsheet images
• updated the code to use a sync image loading API 404c48f, released in v0.1.9
• we verified that the spritesheet resources does exist on user machine and plugin config file appears normal
• user provided new thread dump:

java.lang.IllegalArgumentException: input == null!
	at java.desktop/javax.imageio.ImageIO.read(ImageIO.java:1402)
	at dev.gabrielchl.intellijPets.toolWindow.Pet.<init>(Pet.kt:55)
	at dev.gabrielchl.intellijPets.toolWindow.PetsToolWindowFactory$PetsToolWindowContentPanel.createPets(PetsToolWindowFactory.kt:103)
	at dev.gabrielchl.intellijPets.toolWindow.PetsToolWindowFactory$PetsToolWindowContentPanel.<init>(PetsToolWindowFactory.kt:47)
	at dev.gabrielchl.intellijPets.toolWindow.PetsToolWindowFactory$PetsToolWindowContent.<init>(PetsToolWindowFactory.kt:31)
	at dev.gabrielchl.intellijPets.toolWindow.PetsToolWindowFactory.createToolWindowContent(PetsToolWindowFactory.kt:24)

• it appears that somehow javaClass.getResource() is returning null: https://github.com/gabrielchl/intellij-pets/blob/main/src/main/kotlin/dev/gabrielchl/intellijPets/toolWindow/Pet.kt#L56

Not sure how to proceed :(