textinput: Initial letter only shown in placeholder

[ItzAfroBoy]

Describe the bug
The placeholder value only shows the placeholder's first character when rendered, no matter the property's value length. This first appeared in v0.21.0

Setup
Please complete the following information along with version numbers, if applicable.

• OS: macOS (15.3.2)
• Shell: zsh (omz)
• Terminal Emulator: kitty (0.41.1)
• Locale: en_GB.UTF-8

To Reproduce
Steps to reproduce the behavior:

• Use the textinput module (example code will work for reproduction, but I found this in my project)
• Build & run the code

Source Code
[Official example code (https://github.com/charmbracelet/bubbletea/blob/main/examples/textinputs/main.go).
Here is a snippet showing the placeholder values being set

for i := range m.inputs {
	t = textinput.New()
	t.Cursor.Style = cursorStyle
	t.CharLimit = 32

	switch i {
	case 0:
		t.Placeholder = "Nickname"
		t.Focus()
		t.PromptStyle = focusedStyle
		t.TextStyle = focusedStyle
	case 1:
		t.Placeholder = "Email"
		t.CharLimit = 64
	case 2:
		t.Placeholder = "Password"
		t.EchoMode = textinput.EchoPassword
		t.EchoCharacter = '•'
	}

	m.inputs[i] = t
}

Expected behavior
The placeholder should render the full value. In the example code, this should be:

• Nickname
• Email
• Password

Screenshots
These are with my values: They are supposed to be "Artist" & "Title".
It instead shows "A" & "T".

Additional context
The current fix is to revert to v0.20.0, and the bug does not appear

[halostatue]

This has also been seen in twpayne/chezmoi#4405, also resolved by downgrading. twpayne/chezmoi#4409

[mikesmithgh]

I saw on this on the tag v2.0.0-beta.1. It looks like it happens when the textinput width is 0.

bubbles/textinput/textinput.go

Line 112 in 6010391

width int

Instead of setting to size of placeholder, it truncates it to 1 character.

Workaround: set the width, e.g. ti.SetWidth(20)

This can be reproduced in the textinput example by commenting out the SetWidth call https://github.com/charmbracelet/bubbletea/blob/ba5883a6aa5a203dbff50420d5d0349324dac030/examples/textinput/main.go#L35